Shares of power manufacturers are under pressure, falling by up to 5% on the Bombay Stock Exchange (BSE), after Supreme Court on Monday declared coal block allocations between 1993 and 2010 as illegal.

Tata Power, Adani Power, Reliance Power and Jaiprakash Power Ventures are down 3-5%, while CESC, Torrent Power, JSW Energy, NHPC, NTPC, JSW Energy and Reliance Infrastructure are down between 1-2% on BSE.

S&P BSE Power index, the largest loser among sectoral indices, was down 1.5% compared to a marginal 0.03% gain in the benchmark S&P BSE Sensex at 1020 hours.

“The coal block allocation scam’s verdict likely to hit profitability and margins of metals and mining companies who have been invested billions of dollars on steel and power plants based on the coal blocks”, says analyst at Equentis Capital.

Final verdict on the issue will come out on next hearing on 1 September 2014 in which court will decide whether to cancel the allocations or impose some penalty.

Meanwhile, the Supreme Court on Monday stayed an order allowing Tata Power and the Adani group to charge higher electricity tariffs on account of a rise in the cost of coal.